Question

Oxygen can be produced in the chemistry lab at a low temperature if mixed with manganese dioxide, which acts as a catalyst in the reaction. The chemical equation for the production of oxygen using potassium chlorate is:

2KClO3 → 2KCl + 3O2


This equation represents both a _____________reaction AND a(n) _______________ reaction.
A) combustion; decomposition
B) single replacement; combustion
C) combustion; oxidation-reduction
D) decomposition; oxidation-reduction

Answer 1

The answer is D.
Obs.: Remember that a reaction can only be a combustion if the oxygen is one of the reactants.

Answer 2

The reaction; 2KClO3 → 2KCl + 3O2 represents both  decomposition and oxidation-reduction.

A decomposition reaction is one in which a specie is broken down into its constituents. In this reaction; KClO3 was broken up into KCl and O2. This is why it is classified as a decomposition reaction.

Also, the oxidation number of the chlorine atom was reduced from +5 to -1 while the oxidation number oxygen atom was increased from -2 to zero hence it is also an oxidation-reduction reaction.

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